SERIAL TEMPERATURES. 19 



limit of the poor pelagic hauls begins off the eastern face of the Paumotus 

 running east, somewhat north and south of Lat. 20" S. to about 95° W. Long., 

 when it runs off in a southeasterly direction. South of the southern limit 

 of (2) the pelagic fauna is barren ; its southern limit begins oft" Manga Reva, 

 running eastward and passing somewhat north of Easter Island and Sala y 

 Gomez. 



The southern limit of the rich trawling is found at the latitude of the 

 Marquesas, about in' Long. 125° W., running in an easterly direction to Long, 

 100° W., Lat. 7° S., when the curve takes a bend and runs in a southeasterly 

 direction to Lat. 20° S., Long. 80° W. The northern limit of the poor trawl 

 hauls extends almost to the southern limit of the rich trawl hauls. It forms 

 a regular curve from off the east face of the Paumotus, cutting Long. 100° W. 

 at 10° S. Lat., and thence curves in an easterly and southeasterly direction, 

 cutting Lat. 20° S. at about 84 ' W. Long. The whole of the bottom area of 

 that part of the Eastern Pacific is barren of animal life and forms a great 

 desert on which but little animal life is found and upon which drop the 

 dead carcasses of a poor pelagic area; while the belt of the rich bottom 

 trawling is in a region where the bottom fauna is abundantly supplied with 

 the remains of a rich pelagic fauna. 



No line is shown as the northern limit of the rich trawl hauls, as in the 

 Panamic district to the north of the northern limit of the rich pelagic fauna 

 the bottom fauna was found to be uniformly rich from the equator as far as 

 the coast line. 



The area situated between the northern limit of the rich pelagic fauna (1) 

 and the southern limit of the rich trawl hauls corresponds to the rich belt 

 of the pelagic fauna which is swept north by the Humboldt current and then 

 westward towards the Marquesas and Moser Basin. 



SERIAL TEMPERATURES.! 

 Plates 3* , 4-12. 



All stations marked * are hydrograpliic stations. 



The serial temperature stations occupied on the lines between the Gala- 

 pagos to Aguja Point, southwest from Aguja Point to the western edge of 

 the Humboldt current and east to Callao, as well as on the lines from Callao 



1 The stations at which serial temperatures were taken are marked I on Plate 1. For position of 

 stations see Plate 2. 



